Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012	Jul. 31, 2011
Components of Deferred Tax Assets and Liabilities
Inventories ,Assets	$ 4,984	$ 5,328
Prepaid catalog costs, Assets	13	18
Employee benefits, Assets	2,980	892
Accounts receivable, Assets	1,370	1,979
Other net, Asset	7,267	8,429
Current, Asset	16,614	16,646
Fixed Assets, Assets	2,146	2,189
Intangible Assets, Assets	1,885	1,964
Capitalized R&D expenditures, Assets	2,047	2,807
Deferred compensation, Assets	27,122	23,654
Postretirement benefits, Assets	7,429	6,764
Tax credit carry-forwards and net operating losses, Assets	68,148	62,638
Less valuation allowance, Assets	(25,847)	(27,476)
Other, net, Non current, Assets	156	2,453
Noncurrent, Assets	83,086	74,993
Total, Asset	99,700	91,639
Inventories, Liabilities	(4)	(37)
Prepaid catalog costs, Liabilities	(3,520)	(3,038)
Employee benefits, Liabilities	(4)
Accounts receivable, Liabilities	(11)	(75)
Other, net, Liabilities	(3,221)	(2,363)
Current, Liabilities	(6,760)	(5,513)
Fixed Assets, Liabilities	(5,703)	(7,672)
Intangible Assets, Liabilities	(39,561)	(33,798)
Capitalized R&D expenditures, Liabilities
Deferred compensation, Liabilities
Postretirement benefits, Liabilities
Tax credit carry-forwards and net operating losses, Liabilities
Less valuation allowance, Liabilities
Other, net, Noncurrent Liabilities	(7,146)
Noncurrent, Liabilities	(52,410)	(41,470)
Total, Liabilities	(59,170)	(46,983)
Inventories, Total	4,980	5,291
Prepaid catalog costs, Total	(3,507)	(3,020)
Employee benefits, Total	2,976	892
Accounts receivable, Total	1,359	1,904
Other, net, Total	4,046	6,066
Current, Total	9,854	11,133
Fixed Assets, Total	(3,557)	(5,483)
Intangible Assets, Total	(37,676)	(31,834)
Capitalized R&D expenditures, Total	2,047	2,807
Deferred compensation, Total	27,122	23,654
Postretirement benefits, Total	7,429	6,764
Tax credit carry-forwards and net operating losses, Total	68,148	62,638
Less valuation allowance, Total	(25,847)	(27,476)
Other, net, Noncurrent Total	(6,990)	2,453
Noncurrent, Total	30,676	33,523
Total	$ 40,530	$ 44,656